1955 Soo Locks Centennial stamp
June 18, 1855

The Soo Locks

On June 18, 1855, the first ship passed through the Soo Locks, located on the St. Mary’s River between Lake Superior and Lake Huron. Today there are four locks, and an average of 10,000 ships pass through them each year.

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1998 Golden Gate Bridge stamp
May 28, 1937

Opening of the Golden Gate Bridge

On May 28, 1937, the Golden Gate Bridge officially opened to traffic.  It was the longest suspension bridge in the world at the time of its opening and was dubbed a “Wonder of the World” structure.

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1940 Samuel Morse stamp
May 24, 1844

The First Telegraphic Message

On May 24, 1844, Samuel Morse sent the first message over telegraph. While in the Supreme Court chamber of the US Capitol, he sent the message “What hath God wrought!” over the telegraph to his assistant in Baltimore, Maryland.

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1996 Ottmar Mergenthaler stamp
May 11, 1854

Birth of Ottmar Mergenthaler

Inventor Ottmar Mergenthaler was born on May 11, 1854, in Hatchel, Kingdom of Württemberg (present-day Baden-Württemberg). Mergenthaler invented the linotype machine, which made it quicker and easier to set complete lines of type for printing presses, revolutionizing printing in the 19th century.

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1961 Workmen's Compensation stamp
May 3, 1911

Passage of the First Successful Workmen’s Compensation Law

On May 3, 1911, Wisconsin passed America’s first worker’s compensation program. This law provided financial security for workers injured on the job. By 1948, all the then-48 US states had passed such laws. Alaska and Hawaii had workmen’s compensation laws when they joined the Union.

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1975 Printing Press stamp
April 24, 1704

First Continuously Published Newspaper in America

The first continuously-published newspaper in the American colonies, The Boston News-Letter, published its first issue on April 24, 1704. It was the only continuously-produced paper in the colonies for 15 years and ceased publication in 1776 due to the American Revolution.

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2016 Global Forever Stamp - The Moon
April 16, 1972

Apollo 16 Launches

Apollo 16 launched from the Kennedy Space Center in Florida at 12:54 p.m. on April 16, 1972. It was the 10th crewed Apollo mission and the fifth and second to last to land on the Moon.

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1983 Charles Steinmetz stamp
April 9, 1865

Birth of Charles Steinmetz

Mathematician and electrical engineer Charles Proteus Steinmetz was born Karl August Rudolph Steinmetz on April 9, 1865, in Breslau, Province of Silesia, Prussia (present-day Wrocław, Poland). Steinmetz developed the electrical theories that allowed for the expansion of the electric power industry. He was also known as the “Forger of Thunderbolts” and the “Wizard of Schenectady.”

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1964 Goddard Airmail stamp
March 16, 1926

Goddard’s First Liquid-Fueled Rocket

On March 16, 1926, Robert H. Goddard launched his first liquid-fueled rocket in Auburn, Massachusetts. Though his work went largely unrecognized during his lifetime, today he’s known as the father modern rocketry.

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